Diamond drilling of the Mount Christie ironstone deposit has shown that three main ore types exist in it. At the request of the SA Department of Mines, drill core samples from hole CD1 were combined to produce three composite samples representing the depth footage intervals 70-150, 150-250 and 250-300 feet, reflecting ore types decreasing in grade with depth from 38.6% Fe, through 36.3 % Fe, to 20.7% Fe over the deepest interval. The previously supplied 11 ton surface sample assayed 48.0% Fe. The 70-150 foot sample contained haematite, martite and goethite. The major iron mineral in the 250-300 foot sample was magnetite, with only partial alteration to haematite. Dry magnetic separation tests on the three composite samples, and additional batch and continuous Humphreys spiral tests on the surface sample, were carried out. In the 150-250 and 250-300 feet samples, liberation to produce concentrates of acceptable grade and recovery required that the ore be crushed to minus 18 and minus 72-mesh respectively. On the 70-150 feet sample, a Humphreys spiral produced acceptable concentrates after crushing to minus-18 mesh. Dry magnetic separation of this sample necessitated the feed being crushed to minus 36-mesh, with re-grinding and reseparation of two low grade products to give satisfactory concentrate grade and recovery. Humphreys spiral batch tests on the surface sample produced a concentrate assaying 61% Fe, with a recovery of 85%. Comparative batch and continuous spiral tests on this sample gave similar results. The best iron concentrate recovery with a minimum of grinding was obtained by the following treatments: (a) 70-150 feet: Humphreys spiral (b) 150-250 feet: Dry magnetic separation (c) 250-300 feet: Dry magnetic separation.